Ball-mill.



PATENTED APR. 23, 1907.

H. LGH'NBRT.

BALL MILL. APPLICATION FILED 1mm. 190s.

Z in/70K THE mmms PETERS c0 UNITED srAT s "PATENT 0mm.

BALL-MILL.

Specification of Letters Patent.

Patented April 23, 1907.

Application filed March 6,1906. Serial No. 304,571.

To all whom it may concern:

Be it known that I, HERMANN LoHNERT, manufacturer, a subject of the Kingof Prussia, residing at No. 4 Bahnhofstrasse, Bromberg, in the GermanEmpire, have invented new and useful Improvements in Ball-Mills, ofwhich the following is a specification.

My invention relates to improvements in the method of securing thelining-plates of ball-mills disclosed in my United States Patentapplication, Serial No. 212,587, filed June 14, 1905.

The new invention consists in the provision of means whereby not onlythe pushing strains acting on the bolts, due to lengtheningof the fibersof the plates, but also the pulling and bending strains, can beovercome.

Various forms of the invention are illustrated in the accompanyingdrawings, in which- Figure 1 is a sectional view showing a portion ofthe drum-shell of a mill with liningplates secured according to thisinvention. Fig. 2 is a like view showing the invention applied to asecond form of mill. Fig.3 is a like view in the case of a mill of athird type. Fig. fl is a similar view in the case of the sameconstruction of mill, provision, however, being made to admit ofextension of the liners in both directions.

Referring to the form of construction shown in Fig. 1, the tail end 0 ofeach liningplate a, secured at its head end d to the drum-shell i,protrudes below the head end (Z of the adjacent plate, so that the bolts6 or all the plates are relieved from pushing strains when the fibersstretch, owing to beating of the balls upon the plates.

In order also to avoid injurious bending and pulling strains in. thebolts 1), the heads or nuts of these bolts do not press directly againstthe shell of the drum, but against elastic disks or Washers f insertedbetween the shell and the nuts, so that the bolts 5, when the balls beatupon the-plates, can shift in the direction of their axis-that is tosay, can accommodate themselves to the tendency of the plate ends totravel from the interior of the grinding-drum.

In the case of ball-mills of the constructions shown in Figs. 2 and 3-that is to say, of mills in which both ends of each liner 0 are boltedto the drum-shell independently of the other liners the elastic washersf must be furnished below both the bolts 5 of the head ends and thebolts 9 of the tail ends of the plates a, the latter bolts 9 beingpassed through longitudinal slots h in the drum-shell, so as to makeprovision for lengthening of the plate fibers. The employment of elasticwashers f is also advantageous when provision is made for lengthening ofthe fibers of the liners a in both directions-that is to say, when, forinstance, both the bolts 5 and g pass through longitudinal slots in thedrumshell, as illustrated in Fig. 4. The slots it instead of being inthe drum-shell may of course be provided in the liners a; but thisarrangement will probably be found less advantageous, owing to theliability of the slots to become closed by the hammering action of theballs.

Having thus described my invention, what I claim as new is- 1. Inball-mills, in combination, a drumshell and. a sectional liningtherefor, one of which members has longitudinal slots; bolts holding thesides or the lining-sections to the shell, those at the one side of thesections passing through the said slots; and resilient washers for thebolts; substantially as and for the purposes described.

2. In ball-mills, in combination, a drumshell having longitudinal slots;lining-plates bolts holding both sides of the same to the shell, thoseat one side of the plates passing through said slots and elastic washerslocated between the nuts and the shell; substantially as and for thepurposes described.

In witness whereof I have hereunto signed my name, this 20th day ofFebruary, 1906, in the presence of two subscribing Witnesses.

HERMANN LOI-INERT. Witnesses WOLDEMAR HAUPT, HENRY HASPER.

